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Derivative Instruments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011	Dec. 31, 2011
Derivative [Line Items]
Total fair value of derivative liabilities	$ 0.9		$ 0.9		$ 3.0
Cash Flow Hedging [Member]
Derivative [Line Items]
Maturity period of forward contract			Within 12 months
Period to calculate and evaluate the effectiveness of each hedge			Quarterly
Total notional value of the Company's outstanding forward contracts, designated as foreign-currency cash-flow hedges	38.3		38.3		36.9
Other Foreign Currency Hedges [Member]
Derivative [Line Items]
Maturity period of forward contract			Within 3 months
Total notional value of the Company's outstanding forward contracts, not designated as hedges under hedge accounting	43.0		43.0		37.6
(Loss)/gain related to other foreign-currency hedges	$ 2.7	$ 2.5	$ 1.0	$ 0.5

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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